From: Jiri Benc Date: Mon, 10 Oct 2005 17:16:53 +0000 (+0200) Subject: [PATCH] ieee80211: division by zero fix X-Git-Tag: v2.6.15-rc1~733^2~1^2~36 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=757d18faee58aa4c43bcaf9a44decf17fa68adeb;p=profile%2Fivi%2Fkernel-x86-ivi.git [PATCH] ieee80211: division by zero fix This fixes division by zero bug in ieee80211_wx_get_scan(). Signed-off-by: Jiri Benc Signed-off-by: Jeff Garzik --- diff --git a/net/ieee80211/ieee80211_wx.c b/net/ieee80211/ieee80211_wx.c index ee7a70a..1ce7af9 100644 --- a/net/ieee80211/ieee80211_wx.c +++ b/net/ieee80211/ieee80211_wx.c @@ -152,15 +152,18 @@ static inline char *ipw2100_translate_scan(struct ieee80211_device *ieee, iwe.u.qual.level = 0; } else { iwe.u.qual.level = network->stats.rssi; - iwe.u.qual.qual = - (100 * - (ieee->perfect_rssi - ieee->worst_rssi) * - (ieee->perfect_rssi - ieee->worst_rssi) - - (ieee->perfect_rssi - network->stats.rssi) * - (15 * (ieee->perfect_rssi - ieee->worst_rssi) + - 62 * (ieee->perfect_rssi - network->stats.rssi))) / - ((ieee->perfect_rssi - ieee->worst_rssi) * - (ieee->perfect_rssi - ieee->worst_rssi)); + if (ieee->perfect_rssi == ieee->worst_rssi) + iwe.u.qual.qual = 100; + else + iwe.u.qual.qual = + (100 * + (ieee->perfect_rssi - ieee->worst_rssi) * + (ieee->perfect_rssi - ieee->worst_rssi) - + (ieee->perfect_rssi - network->stats.rssi) * + (15 * (ieee->perfect_rssi - ieee->worst_rssi) + + 62 * (ieee->perfect_rssi - network->stats.rssi))) / + ((ieee->perfect_rssi - ieee->worst_rssi) * + (ieee->perfect_rssi - ieee->worst_rssi)); if (iwe.u.qual.qual > 100) iwe.u.qual.qual = 100; else if (iwe.u.qual.qual < 1)